Process and apparatus for beveling glass



4 Sheets-Sheet l.

May 28, 1,929. N. H. KLAGEs- PRocEss AND A'PPARATS' Fon- BEVELING GLAss Filed June 29; 1927 UE l 4 SheetsfShet. 2

' N. H.. 'KLAGES @N Nm.

`Filed Jupe 29, 1927 May 28, 1929. l

PRocEss AND APPARATUS FOR B'EVELING GLAss f w/ A N u I l mw May 2s, l11929.

Filed June 29, 1927 N. H. KLAGES PROCESS AND APPARATUS FOR BEVELING GLASS f ,mg 4.

` INVENTGR' May 28, 1929.

N. H. KLAGES Filed June 29, 1927 4 Sheets-Sheet 4 INVENI'OR Patented May 2s, 19295.

UNITED STATES PATENT OFFICE.

NORMAN H. KLAGES, OF PITTSBURGH., PENNSYLVANIA, ASSIGNOR TO W. I'ILAGES & SON, ING., A .CORPORATION 0F PENNSYLVANIA.

PROCESS AND APPARATUS FOR BEVELING- GLASS.

Application filed .Tune 29,

AThe invention relates to a process and apparatusfor beveling glass, and particularly for beveling small size glass sheets for use in lrear view mirrorsy for automobiles andthe like. The invention has for its principal objects, the provision of a method and a machine o1' apparatus for carrying it out,

whereby; (1) a very high production may be secured, and (2) whereby the glass maybe beveled in a superior manner, withoutany chipping, and with smooth sharp edges at the intersection ef the beveled surface with the other surfaces of the sheet. Briefly stated, these results are accomplishednby the' vuse of an annular grinding or beveling Wheel, itself old in the art,l arranged to cut diagonally across the edge of the glass sheet, while the glass is moved in a direction op.- posite to that of the wheel, where it engages the' glass. This method of operation, in conjunction with. the feature of holding rigidly in contact with the wheel (rather than yieldingly, as has heretofore been done) gives the results heretofore referred to, namely, sharp, smooth edges at the confines of the beveled surface, and an absence of chipping. A further result secured by this method is the `uniform wear imposed on. the wheel so that it grinds satisfactorily until the annular portion is used up. Other features contributing to the success of the operation are the holding of the sheet being beveled against vibration vand chattering, this being done by the hands of the operator, and the provision of stop means arranged to oppose the movement ofthe sheets in the two directions in which the diagonal cutting action of the wheel tends to move them. In carrying out the operation, as above described, the glass is given a movement across the face of the annular wheel, and the axis of rotation of the grinding wheel is fixed, but it will be understood that the same result is accomplished, if the arrangement is 'reversed and the Iglass sheet is held in fixed position and the wheel moved along theglass, and that the invention comprehends both arrangements or methods of use. One 'form of apparatus for carrying out the process is shown in the accompanying drawings, wherein:

Figure 1 is a plan view. Fig. 2 is a front elevation. Fig. 3 is a section on the line III-III of Fig. 1. Fig..4: is a section on y the line IV-IV of F ig. 1. Fig. 5 is a section on the line V--V of Fig. 1. And Figs.

1927. serial No. 202,190.

6, 7 and 8 are enlarged detail views of the grinding wheel and its relation to the work, Fig. 6 being a front elevation, Fig. 7 a plan view with the grinding wheel in horizontal section at the level of the cut, and Fig. 8 an end elevation', but with thel grindingwheel 1n section. y

Referring to the drawings, 1 is the frame-` work of the machine, upon which Aare mounted the two annular lgrinding wheels 2, 2; the two4 reciprocating tables 3, 3 carrying the sheets of glass 4, 4; and the motor 5 for moving'the tables back and forth on the guides 6, 6. The grinding wheels 2, 2 are carried by the spindles 7, 7, having at their ends, the pulleys 8, 8, and these pulleys are driven, by means of belts from a suitable source of power, not shown.

The tables 3, 3 Ahave the plates 9, 9,' which carry the sheets of glass, incl ined at angles of about'et degrees to thehorizontal, as indicated in Fig. 3. Thetables are mounted for reciprocation on the V-shaped guides 6, 6, as indicated in Fig. 3,.and are moved back 'and forth by the connecting rods 10, 10, pivoted at their outer ends to the tables land'at their inner ends to the vertical pin 11 carried by the end of thebar .12, the other end of such bar being pivoted at 13 to the end of the pillar 14 carried by the frame (Fig. 4). .Located below the ba112 is the disc wheel 15 mounted upon the vertical shaft 16, and this shaft is rotated from the motor 6 through the intermediary of the worm 17 on the motor shaft and the worm wheel 18 on the shaft 16. The disc wheel is provided with a crank pin 19 which carries a roller 20 mounted in the slot 21 on the lower side of the bar 12. The rotation of the disc wheel, therefore, moves the bar back and forth around the pivot 13, and causes the reciprocation of the rods 10, 10 and the carriages 3, 3 upon whichthe glass plates to be beveled are carried. By this means, the

tables or carriages 3, 3 are carried back and 100 in eachV case serving to complete the bevel,

as later more fully explained.

The spindle 7 of each wheel is mounted for longitudinal adjustment, as indicated in Fig..3, to compensate for the Wearing away ofthe faceor edge of the wheel, The an- ,110

ma @a nular portion of the wheel is mounted upon a metal plate 22 having a hub which is keyed to one end of the spindle, the other end ofv the spindle being keyed tothe drive pulley 8. The spindle rotates in the sleeve 23, such ysleeve carrying the anti-friction bearings 24 and 25, clamped in position by the nuts 26 and 27. The sleeve is'carried by the `blocks orA lugs 28 and 29, being slidable ythrough the Iblock 28 and Vthreaded through the block 29. By rotating the sleeve, therefore, the spindle and grinding wheel may be adjusted forward from time toitime to maintain the grinding face of the wheel in substantially lthe same position this being continued until the wheel is substantially worn away. As later explained, the wearing away" of the wheel, due to the process employed, is uniform and the angle ofthe face of. the wheel remains constant after the operation is well under way, so that the grinding effeet of the wheel remains substantially the same-throughout its life. -As indicated in Figs. l Aand 5, the sleeve is provided with a -plurality of slots 30 at its forward en@` which maybe engaged by the springpre'sse pin 31, so that the sleeve is held in any dein locked A position.

siredv position of rotary adjustment. This pin is carried by thecollar 32 v,secured 'to the block 28Y by means of the Abolt-and, slot connection 33,v 34, a handle 35 being provided for turning the Collar. This provides a means for rotating f the sleeve ,de ees from one position of adjustment to the next one, the bolt 34 serving to lock the; partsy The inclined plates o'r tables are eachplrolj .T'vided with a stop 36 along"the.lover edge anda stop 37 at one end (Figs. '6, 7 and 8) for positively holding the glass sheet f4 'against movementwhileunder the action of the grinding wheel and for positioning the VAsheet upon the plate. The operator" holds the .sheet tightly against thesestops, thusv eliminating vibration land avoiding breakage -or chippingdue to such c ause. In operation, theplate ortable carries .the edge to be beveled laterally across the face of the rinding wheel at about the level indicatedV ment being off.

,axis of rotation'jA of the plate. WrithV the .the line 38 in Fig. 6, suchvline of moves center with respect to the plate 9 and' its glass sheet moving inv the direction of the arrow (Figji), the Wheel rotates counter clockwise, indicated by Y the arrow. The cutting edge ofthe wheelthus gives the glass a diagonal shearing cut,

and acts upon the glass tending to force itagainst V the stops 36 and 37. This reduces the effort required by the Aoperator to hold the 'sheet in position, and' gives'` a muchV smoother,

better cut, than if this condition didv not obtain. This is particularly im- .:portant as applied to the 3 stop 36, as the 'contact ,of-,this stop in close proximity 'to away from each other,

the grinding wheel to "ing 39.(

periphery,

holding.

vmovement away y 'lf/1495s .familiar and which all operate to cut thev bevel by the use of'two or more passes over the wheel, but gives a better product free from chipping and with more sharply de fined lines at the limits of the beveled surface. Another feature incident to the process, of even greater importance, isthe mounting of thergrinding wheel spindle and of the plate 9 upon its (guides, so that these 4parts are relatively'rigid, as compared to apparatus. heftfre used, in whichone of these'jparts' is allowed toyield and move away from the other part slightly' during the grinding operation, thus givinga yielding er'igagement 'between the glass and wheel. I have" found that the unyielding engagement, due to the fact that the wheel nd guides are rigid,-as .against movement A i reduces breakage and chipping and causes wearuniformly, so that its face maintains ,angle throughout the life of the wheel.

" As indicated in Fig. 7, the axisof rota? so that the wheel cuts only upon one side,

this' being a featurer of'construction,` which is important, but well known in the art. Thegrindingvwheel is enclosed by a suitable casig. l3) and'pwater is supplied downwardly between the edge of the sheet 4 and the edge ofthe grindinglwheel by any suitablevmeans to facilitate the cutting action of ,the wheel is common in the art.

What Iclaimis: l. A processl of beveling a glass sheet,

which consists in Vcausing al relative movement of the edgev to'be beveled in the direction ofV length thereofv with respect to a relatively large annulargrinding wheel having Itselfv at a proper and eicient grindingv its aiiisinclined with respect to said direction ofmovement and having its face beveled back from its central portion towards its so* that the wheel engages the glass on one side only of its center and cuts a bevel from one end the sheet against vibration and also holding the wheel and sheet flrmly against relative movement, and positively engaging stop-means along a part ofthe thickness of of the sheet'to the other,

from each-other during said the edge. of the sheet next to the wheel with 25 tively engaging another edge of the sheet i 'Wietse the movement of rotation of the cutting side of the ,wheel as it engages the glass ,edge having a component tending to move the sheet toward the stop means andalso having a-component tending lto movejthe sheet in a direction opposite to said relative movement, and the entire bevel-being cut at one pass.

2. A processof beveling a glass sheet,

which consists in causing the edge to be to travel longitudinally thereofbeveled across the. face of a heavy annular grinding wheel having its axis inclined to the line o travel ofl the edge and having its face beveled back from its central portion to its periphery, the edge ofthe sheet vbeing od'.

center with respect to the centerl of rotation ofthe wheel, and engaging only one side of i the'wheel, holding the sheet against vibra tion and also holding the sheet and` wheel firmly against oscillation or movement away rom'each other, positively engaging said edge with stop means along a part of itsthickness so as toposition it and hold it against movement toward `the wheel, posilying at right angles to said first edge with stop means and cutting the entire bevel at one pass, the 4movement of the cutting side of the wheel as it engages the glass tending ment in front 'relation of the cutting to move the glass againstboth vof said stop means. p

3. In combination in beveling apparatus, n` annularl grinding wheel element which is relatively lar e and heavy and has its face beveled back groin its central portion toward its periphery,

ofthe wheel and inclined at an angle thereto,' a stop at'the edge of the 'plate nearest the wheel projecting out past the face thereof a distance equal to a part only-of the' thickness engaging one end 4of elements being mounted for movement in a direction lengthwise 'of said sheet, and saidsupporting element and Wheel b,eing'-=firmly held against relative movement away from each other5 and means for reciprocating said movable element, the

edge. of the wheel t0- the'two stops being such as to tend by its rotation to force the sheet against both 'of said stops, and the face ofA the wheel being inclined with respect lto the edge of the sheet so that it engages the glass on one side only of its afxisof rotation.

the sheet, one of said a sheet supporting plate eleof the sheet to be f In testimony whereof,` I have hereunto 

